PVC heat stabilizers commonly used in two test methods

PVC heat stabilizers torque rheometer test method
Mimic the actual torque rheometer PVC processing a typical small pilot-type apparatus. Outside of the PVC flame retardant  instrument a closed processing tank, connected to the instrument by the computer can control the machining tank temperature, and within two roll speed, torque rheometer added quality of materials is generally 60 ~ 80 g, depending on the apparatus and different models. Experimental steps of: preparing in advance with different thermal stabilizer masterbatch based on PVC masterbatch formulation, in addition to other ships and ACR, CPE, CaCO3, TiO2, lubricants and the like. Torque Rheometer advance the set temperature, when the egetable stearic acid  temperature rose to specify and steady speed, will be weighed mixture added processing chamber, quickly closed records on a computer connected to a variety of parameters, namely flow curve. After processing, you can also get different extrudate physical characteristics, such as whiteness, whether shaping, smoothness and so on. These parameters can determine the  aluminum hydroxide corresponding potential industrial heat stabilizers, heat stabilizers suitable shall have suitable torque and plasticizing time of the extrudate should be preferably molded and whiteness, surface smoothing. Torque rheometer in laboratory studies and between industrialized mass production to build a convenient bridge.
PVC heat stabilizers roll blackening test
Determination of thermal stability as a dynamic effect of a class of helper methods, dynamic two-roll used in the absence of the rheometer, the experiment instrument select double rolled sheet, which together with the high-speed mixed powder, compression molding, the resulting samples were subjected to extruded repeatedly until the black test piece until completely black record time, the time is called blackening. Blackening by comparing the length of time to determine the type of thermal stabilizer effect of the thermal stability of PVC.